clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- EXISTS over a keyless aggregate returns false when the subquery builds a set
- `isNull` and `IS NULL` return the raw null-map byte instead of a boolean — `sum(x IS NULL)` overcounts, `GROUP BY x IS NULL` yields three groups, and a `(x IS NULL) = 1` filter silently drops NULL rows
- An `Enum` constant nested in a composite `IN`-set member converts to its underlying number, so `IN` matches the wrong row and disagrees with `=`
- Allow query parameters in ALTER object names
- The `azurite` emulator used by integration tests crashes with a general protection fault in musl
- A torn (zero-byte `data.packed`) packed part in `detached/` wedges the replication queue forever: `ATTACH_PART` throws while probing the candidate's format, before the broken-candidate handling and the fetch fallback
- Correlated subquery over a `Merge` table fails with `Cannot clone ReadFromMerge plan step` when decorrelation duplicates the outer plan (`correlated_subqueries_use_in_memory_buffer = 0`)
- Fix(Geo): geohashDecode accepting invalid characters
- Add BPE tokenization with tokenizeBPE and detokenizeBPE
- Analyzer conflates constants that print identically but differ in bits: NaNs with different payloads collapse into one column
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- C++ not yet supported